feat(dynamics): add PlusDI, MinusDI, PlusDM, MinusDM indicators

Complete thin Dx-composition wrapper indicators with full test coverage:

- PlusDi/MinusDi: Directional Indicator wrappers (DiPlus/DiMinus from Dx)
- PlusDm/MinusDm: Directional Movement wrappers (DmPlus/DmMinus from Dx)
- Individual validation tests per indicator directory (TALib, Skender, bounds)
- Combined unit tests (DiDm.Tests.cs) and validation tests (DiDm.Validation.Tests.cs)
- Quantower wrappers + tests for all 4 indicators
- PineScript v6 implementations with compensated RMA
- Normalized .md documentation for all indicators and categories
- 182 tests passing, 0 failures

lib/channels/apchannel/apchannel.md

@@ -1,5 +1,7 @@
 # APCHANNEL: Adaptive Price Channel
 
+> *An adaptive channel reshapes its width in real time, tracking the market's own sense of normal.*
+
 | Property         | Value                            |
 | ---------------- | -------------------------------- |
 | **Category**     | Channel                        |
@@ -74,30 +76,6 @@ $$t_{1/2} = \frac{\ln 2}{\ln(1 / (1 - \alpha))}$$
 
 For $\alpha = 0.2$: $t_{1/2} \approx 3.1$ bars. For $\alpha = 0.05$: $t_{1/2} \approx 13.5$ bars.
 
-### Pseudo-code
-
-```
-function APCHANNEL(high, low, alpha):
-    validate: 0 < alpha ≤ 1
-    decay = 1 - alpha
-
-    // EMA of highs
-    if first_bar:
-        upper = high
-    else:
-        upper = decay * upper + alpha * high
-
-    // EMA of lows
-    if first_bar:
-        lower = low
-    else:
-        lower = decay * lower + alpha * low
-
-    middle = (upper + lower) / 2
-
-    return [middle, upper, lower]
-```
-
 ### Output Interpretation
 
 | Output | Description |